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宁南—六盘山地区延安期原盆恢复

发布时间:2018-01-13 15:01

  本文关键词:宁南—六盘山地区延安期原盆恢复 出处:《西北大学》2015年硕士论文 论文类型:学位论文


  更多相关文章: 宁南-六盘山地区 延安期 物源分析 构造格局 原盆恢复


【摘要】:原盆恢复即剔除后期改造的影响,恢复盆地主要发育时期和演化阶段的原始面貌特征,它是沉积盆地分析的重要内容,也是目前沉积盆地研究的难点和重点。原盆恢复的研究对探讨沉积盆地演化及能源矿产资源勘探等意义重大。本论文选择鄂尔多斯盆地西部宁南-六盘山地区为研究区,以研究程度相对薄弱的早-中侏罗世延安组为重点层段。在“原盆恢复”理论的指导下,以大量野外露头剖面、油田、煤田资料及相关分析测试为基础,综合运用沉积学、构造学法、地球化学、地球物理等相关理论与技术方法,对延安组的地层时代划分、展布、沉积环境及原始沉积边界进行了系统剖析,结合周邻同期地质特征探讨了延安期原始盆地面貌,主要取得了以下进展和认识:(1)重新厘定了研究区炭山、窑山、麻黄沟等地区具“上三叠统\中下侏罗统”之争的煤系地层时代,将其时代归为早-中侏罗世。(2)揭示了研究区延安期发育多个沉积-沉降中心,地层展布总体呈西厚东薄的趋势。西部六盘山地区延安组沉积受多条断裂控制,凹陷呈多列串珠状排列,沉积厚度大,远大于鄂尔多斯西缘及周缘山间盆地同期地层。(3)物源综合分析结果表明,研究区延安期物源主要来自北部阴山地块和西北部阿拉善古陆,南部秦岭和西南部北祁连构造带贡献相对较小。(4)指出前侏罗纪研究区遭受西强东弱的构造变动事件,延安组沉积之初研究区发育多个隆起,地貌起伏不平。延安期总体处于弱伸展环境,断裂对沉积作用控制明显。(5)原始盆地边界西南海原断裂为界与北祁连隆起相邻,西北以中宁-中卫断裂和贺兰山西麓断裂分别与卫宁北山古隆起和阿拉善古陆相邻,北部边界可达阴山-河套古隆起,东、西分别与鄂尔多斯盆地河西走廊相连通。(6)延安期初期,研究区隆凹相间,以河流冲积体系为主,仅祁连山前缘发育多个小型浅湖,河流最终汇入之东的甘陕古河;盆地发育鼎盛时期,印支期古隆起不复存在,盆内断陷作用加强,小型湖泊扩张成一大型断陷湖盆,受鄂尔多斯盆地大型湖泊扩张的影响,早期的河流沉积体系演变为河流-三角洲沉积体系。
[Abstract]:The original basin restoration is to exclude the influence of the later transformation, and to restore the original features of the main development and evolution stages of the basin, which is an important content of the sedimentary basin analysis. The study of basin restoration is of great significance to the exploration of sedimentary basin evolution and exploration of energy and mineral resources. In this paper, the western Ningnan-Liupanshan area of Ordos basin is selected as the. Research area. Under the guidance of the theory of "original basin restoration", based on a large number of outcrop profiles, oilfield and coalfield data, and related analysis and tests, this paper takes the relatively weak early and Middle Jurassic Yanan formation as the key formation. Based on the relevant theories and techniques of sedimentology, tectonics, geochemistry and geophysics, the stratigraphic epoch division, distribution, sedimentary environment and original sedimentary boundary of Yan'an formation are systematically analyzed. The features of Yanan primitive basin are discussed in the light of the geological characteristics of the same period in the neighboring region. The following progress and understanding are obtained.) the study area of carbon Mountain and Kiln Mountain is redetermined. In Mahuanggou and other areas, there is a "Upper Triassic / Middle and Lower Jurassic" Coal-bearing Strata era, which is classified as Early-Middle Jurassic. 2) it is revealed that there are many sedimental-subsidence centers developed in Yanan period of the study area. The deposition of Yan'an formation in the western Liupanshan area is controlled by many faults and the sag is arranged in a series of beads with a large thickness. The results show that the Yanan period provenance in the study area is mainly from the Yinshan block in the north and the Alashan paleocontinent in the northwestern part of the study area. The contribution of the southern Qinling and the southwestern North Qilian tectonic belt is relatively small. It is pointed out that the study area of the pre-Jurassic was subjected to the tectonic changes of the west, strong, east and weak, and several uplifts were developed in the study area at the beginning of the Yanan formation. The Yanan period is in a weak extensional environment, and the faults control the sedimentary process obviously. 5) the margin of the primitive basin boundary is adjacent to the North Qilian uplift. In the northwest of China, Zhongning-Zhongwei fault and Helan mountain western foot fault are adjacent to the ancient uplift and Alashan ancient land of Weining North Mountain, respectively, and the northern boundary can reach Yinshan-Hetao ancient uplift, east. In the early Yanan period, the study area consists of river-alluvial system, and only several small shallow lakes are developed in the front edge of Qilian Mountains. The river eventually flows into the ancient Ganshan River to the east; At the peak of the basin development, the Indosinian paleouplift ceased to exist, the intrabasin faulting was strengthened, and the small lakes expanded into a large faulted lake basin, which was influenced by the large lake extension in the Ordos Basin. The early fluvial sedimentary system evolved into fluvial-delta sedimentary system.
【学位授予单位】:西北大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:P618.13

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